New iMac processor

Discussion in 'Macintosh Computers' started by bpd115, Sep 9, 2003.

  1. macrumors 6502a

    bpd115

    Joined:
    Feb 4, 2003
    Location:
    Pennsylvania
    #1
    I was wondering if the new iMacs are using a new G4 or have they simply increased the FSB to 333 effectively overclocking the chip?

    Assuming the chip had a 7.5 multiplier, the 133 fsb of the previous generation would give you 997.5 Mhz or ~ 1Ghz.

    Keeping the same Multiplier of 7.5 and increasing the bus to 166 (333 DDR) you come out to 1245 Mhz or ~1.25.

    Now if I could only find out how to increase the FSB of my Ghz iMac I'd be set :cP
     
  2. macrumors regular

    Joined:
    Jul 12, 2003
    #2
    I believe the prvious top-end iMac had a FSB of 167 Mhz, and th 15" had 133MHz bus.

    Now both have a 167Mhz bus. The bus multipliers are x6 and x7.5 (for 1 and 1.25 Ghz).
     
  3. thread starter macrumors 6502a

    bpd115

    Joined:
    Feb 4, 2003
    Location:
    Pennsylvania
    #3
    I have the previous top of the line 1 Ghz 17inch. The ram is 266 (133 FSB) DDR (Although the G4 design only operates on an SDR bus, meaning 133.)..
     
  4. macrumors 6502

    Joined:
    Apr 20, 2003
    Location:
    East Coast, US
    #4
    The real question...

    The real question is this: Is the new iMac using the Motorola 7457 processor, or just a Motorola 7455 processor that is overclocked to 1.25 ghz?

    If they are using the 7457 processor, this bodes well for the near-term availability of new 15" and 17" PowerBooks based on the same logic board design. It also means that Motorola is probably finally able to deliver these processors in volume.
     
  5. macrumors 603

    Dont Hurt Me

    Joined:
    Dec 21, 2002
    Location:
    Yahooville S.C.
    #5
    7455, which by the way there is nothing wrong with at higher clocks such as 1.25. i expect a 1.2 g5 in the next powerbook,heat and power are about the same as 1 gig g4. the 1.25 imac is a very solid machine in my opinion.
     
  6. macrumors 6502a

    Joined:
    Mar 20, 2003
    #6
    The 7457 is better at equivalent clock speeds, it requires less power, generates less heat, has twice the cache and the bus is even faster.
     
  7. thread starter macrumors 6502a

    bpd115

    Joined:
    Feb 4, 2003
    Location:
    Pennsylvania
    #7
    IF the powerbooks get a G5 in a few days I'll be selling a kidney to buy one (and then getting beat by my gf for not buying her an engagment ring yet...what can I say, it's a sickness!)
     
  8. macrumors 603

    Dont Hurt Me

    Joined:
    Dec 21, 2002
    Location:
    Yahooville S.C.
    #8
    also isnt out yet.
     
  9. macrumors 6502a

    Joined:
    Mar 20, 2003
    #9
    Actually it is; the question is how about in volume though.
     

Share This Page